Sensitivity analysis of the air temperature variations in a Chinese solar greenhouse
Chinese solar greenhouses (CSG) are widely used in northern China to produce vegetables and flowers year round without auxiliary heating during the winter. Air temperatures inside a CSG can be accurately predicted by computational fluid dynamics (CFD) models. This paper describes the influence of the outside air temperature, sky temperature, heat transfer coefficient between the outside of the plastic cover and the air (HTC), solar transmissivity of the plastic cover and the leaf area index (LAI) of the crops on the inside air temperatures as indicated by sensitivity factors. The results show that the inside air temperature is more sensitive to changes in the outside air temperature than the other parameters, with a sensitivity factor of 0.2, while the HTC is the least sensitive parameter with a sensitivity factor of 0.001. This sensitivity analysis for various meteorological and thermal parameters will benefit future environmental simulations and CSG designs.
Tong, G. and Christopher, D.M. 2017. Sensitivity analysis of the air temperature variations in a Chinese solar greenhouse. Acta Hort. (ISHS) 1170:71-78
light transmission, heat transfer coefficient, leaf area index (LAI), sky temperature, sensitivity factor, computational fluid dynamics (CFD)